Table 2.

Results of the exploratory factor analysis.

Source	Single Items	Constructed Factor
TWINS Occupational Safety	-My direct supervisor openly addresses problems concerning occupational safety in our hospital (single item) -My direct supervisor focuses more on occupational safety than a year ago (single item) -It is important to my direct supervisor that our hospital pays great attention to occupational safety (single item)	Factor “Occupational safety-related behaviour of the direct supervisor”
TWINS Occupational Safety	-Hospital management openly addresses problems concerning occupational safety in our hospital (single item) -Hospital management focuses more on occupational safety than a year ago (single item) -It is important to the hospital management that our hospital pays great attention to occupational safety (single item)	Factor “Occupational safety-related behaviour of the hospital management”
TWINS Patient Safety	-My direct supervisor openly addresses problems concerning patient safety in our hospital (single item) -My direct supervisor focuses more on patient safety than a year ago (single item) -It is important to my direct supervisor that our hospital pays great attention to patient safety (single item)	Factor “Patient safety-related behaviour of the direct supervisor”
TWINS Patient Safety	-Hospital management openly addresses problems concerning patient safety in our hospital (single item) -Hospital management focuses more on patient safety than a year ago (single item) -It is important to the hospital management that our hospital pays great attention to patient safety (single item)	Factor “Patient safety-related behaviour of the hospital management”
HSPSC-D [22]	-Frequency of event reported (scale, three items) -Overall perceptions of patient safety (scale, four items) -Patient safety grade (single item) -Safety grade in the medication process (single item)	Factor “Perceived patient safety”